Effect of salinity and deficit irrigation on some ions uptake by rapeseed (Brassica napus L.) under two planting methods

ABSTRACT In this study, effect of deficit irrigation with different salinity levels and planting methods (infurrow and onridge) on nutrient and toxic ions uptake by rapeseed was investigated in a twoyear experiment. The experiment was conducted at Research Station, located in the College of Agriculture, Shiraz University, I.R. of Iran. Results indicated that an increase in water stress level decreased uptake of potassium (K), calcium (Ca), sodium (Na) and chloride (Cl) by plant and with exception of K, those uptakes were enhanced by an increase in salinity of water and soil. Furthermore, a decrease in applied water decreased the threshold of Na in soil for seed yield reduction. Deficit irrigation had a significant effect on slope of the fitted line between Cl in plant (Clp) and Cl in soil. The Clp threshold for seed yield reduction was significantly different for two planting methods in full irrigation regime so that seed yield reduction occurred in higher Clp in infurrow planting method. Also, a decrease in applied water decreased Clp threshold for seed yield reduction.